Preheat the oven to 350°F. Grease the 8"x 8" pan with cooking spray.
In a small bowl: combine flour, brown sugar, cinnamon, salt, old fashioned oats and mix. Add cold butter & mix until it begins to form coarse crumbs. Set aside.
1 cup light brown sugar, ¾ cup old fashioned oats, ¾ cup all-purpose flour, ½ cup cold unsalted butter, 1 tsp cinnamon, ¼ tsp salt
Peel & remove core of the apples. Cut into ¼" cubes and then place in a bowl. Add sugar, cinnamon & lemon juice. Mix everything together and transfer the apple mixture to the pan, Sprinkle the crisp topping mixture on top of the apples.
6 apples (Gala, Fuji, Jonagold, Honeycrisp, Red Delicious or Golden Delicious), 2 tbsp granulated sugar, 2 tsp lemon juice, 1 tsp cinnamon
Bake for 40-50 minutes or until golden brown. Remove from the oven and let cool for 5 minutes before serving.